Income Taxes - Unrecognized Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized income tax benefits, January 1	$ 325	$ 387	$ 452
Additions for tax positions of prior years	108	26	11
Reductions for tax positions of prior years	(121)	(45)	(11)
Additions for current year tax positions	0	0	19
Reductions for settlements with taxing authorities	(1)	(23)	(60)
Other	(7)	(20)	(24)
Unrecognized income tax benefits, December 31	304	325	387
Expenses (Income) for interest and penalties on tax reserves	(17)	(3)	$ 15
Accrued interest and penalties	$ 14	$ 35